Word.ws English Dictionary

RER

RER noun: a type of railway system that generally runs from suburbs or satellite towns into a city centre, with a central tunnel or overground corridor with higher speeds and more widely spread stations than a subway or metro.

Noun

RER (plural RERs)

  1. A type of railway system that generally runs from suburbs or satellite towns into a city centre, with a central tunnel or overground corridor with higher speeds and more widely spread stations than a subway or metro.
    • […] the recently approved Crossrail link, together with the existing Thameslink, constitute the basis of an RER for London, which by the end of this decade will provide a single system, linking Reading with Colchester and Cambridge[…]1991, Working Paper
    • Reinvented according to this model—called regional express rail (RER)—Metra's key hubs would be O'Hare Airport, the Loop, and McCormick Place.2021 November 10, “A path to high-speed rail in Chicago—through a reinvented Metra”, in Chicago Business

Proper noun

RER (plural RERs)

  1. Any of many RER systems in French-speaking countries.
  2. GO Expansion, a project to improve commuter rail in Ontario.
    • GO Transit also uses some tunnels in the city. Its Metrolinx RER programme includes laying 150km (93 miles) of new track, and some of this, for example under Highways 401 and 409, will be in tunnel.2020 September 8, Mark Ovenden, Underground Cities: Mapping the tunnels, transits and networks underneath our feet, Frances Lincoln, →ISBN, page 42

Forms of RER

Noun
pluralRERs
Proper noun
pluralRERs

Origin of RER

From French RER, often reinterpreted as "Regional Express Rail".

Phrases with RER

Questions about RER

What does RER mean?
RER means a type of railway system that generally runs from suburbs or satellite towns into a city centre, with a central tunnel or overground corridor with higher speeds and more widely spread stations than a subway or metro.
What part of speech is RER?
RER can be a noun or a proper noun.
What is the plural of RER?
The plural of RER is RERs.

Words near RER in the dictionary

  1. requote
  2. requoted
  3. requotes
  4. requoting
  5. Requínoa
  6. RER
  7. Rer Bare
  8. reracialization
  9. reracialize
  10. reracialized
  11. reracializes

Source and license

Adapted from Wiktionary: RER (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “RER.” Word.ws, https://word.ws/rer. Based on Wiktionary, CC BY-SA 4.0.